Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 115 · 40 questions

The trick (Last digits only): Multiply (or add) only the last digits of the two numbers. The last digit of that result is the last digit the answer must have. Different last digit → wrong for sure. Same last digit → it passes the check (work it out in full to be certain).

1. 1.Last-digit check: is 62 × 43 = 2657 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 16 × 33 = 528 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 443 + 308 = 752 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 870 + 246 = 1114 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 99 × 26 = 2578 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 121 + 824 = 944 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 74 × 37 = 2730 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 971 + 250 = 1221 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 73 × 18 = 1315 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 702 + 149 = 848 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 48 × 30 = 1434 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 95 × 80 = 7600 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 879 + 751 = 1631 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 258 + 552 = 804 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 89 × 86 = 7662 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 52 × 22 = 1144 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 215 + 231 = 446 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 25 × 33 = 816 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 20 × 36 = 720 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 680 + 115 = 793 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 36 × 54 = 1947 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 990 + 943 = 1941 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 168 + 134 = 299 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 300 + 366 = 665 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 89 × 94 = 8374 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 911 + 907 = 1820 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 493 + 185 = 678 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 44 × 15 = 660 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 51 × 98 = 4998 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 47 × 26 = 1222 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 73 × 98 = 7154 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 38 × 87 = 3306 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 86 × 47 = 4044 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 41 × 60 = 2460 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 594 + 652 = 1254 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 767 + 570 = 1337 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 881 + 537 = 1418 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 246 + 442 = 694 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 30 × 31 = 929 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 47 × 56 = 2627 right or wrong? (a) Right (b) Wrong

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